Furnace construction.



F. E. STINCHPIELD.

FURNACE CONSTRUCTION. APPLICATION FILED APR.27.11906.

wi l

Gum, 5

PATENTED JUNE. 25, 1907.

UNITED STATES I ATENT OFFICE.

FRANK E. STINCHFIELD, OF NORFOLK, VIRGIN1A,ASS1GNOR or ONE-HALF TO CURTIS P. SMITH, OF NORFOLK, VIRGINIA.

FURNACE CONSTRUCTION.

Specification of Letters Patent.

Patented June 25, 1907.

Application filed April 27, 1906. Serial No. 314,061.

To all whom it may concern:

Be it known that I, FRANK E. STINOH- FIELD, a citizen of the United States, resid ing at Norfolk, in the county of Norfolk and State of Virginia, have Invented certain new and useful Improvements in Furnace Constructions, of which the. following is a speck cation.

This invention relates to new and useful improvements in steam boiler furnaces and it particularly contemplates a furnace designed to effect the complete consumption'of fuel whereby the total economic efliciency of the fuel 1s utilized. and the smoke nu sance overcome.

The invention broadly provides for the imbe eliminated by the provision of independent means for treating or directing the incoming current of air in order that it mayeffect a more complete combustion of carbon without decreasing the heat of the fire bed. The effects in this direction have, however met with only a partial success.

It is the primary object of the present i11- vention to completely eliminate the objections above noted .and in this connection novel air feeding means are employed by which the air supply into the furnace is not only regulated as desired, but the air ad mitted is caused to project rearwardly in a vortex jet against a deflecting plate heated to incandes'cence and arranged in a smoke consuming chamber.

The detailed construction will appear in the course of the following description in which reference is had to the accompanying drawings forming a part of this specification, like numerals designating like parts throughout the several views, wherein,

Figure 1 is a side elevation of a furnace, embodying my invention, a side wall thereof being removed. Fig. 2 is a section, partly in elevation on the line 2 of Fig.1, but difiering therefrom in the construction of the bridge wall between the fire-box and the combustion chamber. Fig. 3 is a vertical transverse section'on the line 3 3 of Fig. 1. an enlarged central longitudinal section of the air feeding means constituting one element of the invention, and Fig. 5 is a verticaltransverse section thereof.

In the practical embodiment of my invention, I employ a furnace comprising side walls 1 and a bridge wall 2 arranged therebetween and dividing the space between the walls 1 into independent chambers, of which the forward chamber 3 serves as a fire-box and is providedwith'a horizontal grate 4 and the rear chamber 5 as a combustion chamber; The chamber 5 is provided with'a rear wall 6'and a floor 7. In the space between the walls 2 and 6, a roof of refractory material is arranged for the chamber 5. This roof isdesignated by the numeral 8 and is concave,

so as to hug the sides of the boiler. Centrally of the roof 8 a depending baflie of refractory material 9 is provided, whichprojects approximately midway into the chamber 5. Commimication-is had between the chambers 3 and 5 by 0 enings 10 arranged in the bridge wall 2. T 1e openings 10 may be constructed and arranged as shown in Fig. 2 with vertical partitions 11 therebetween, or a single enlarged opening 12 eX- tending entirely across the bridge wall may be employed, as indicated in Fig. 1. A horizontal boiler 13 of conventional form is su ported upon the walls 2 and 6 and from t e walls 1. Communication is had between the chamber 5 and the rear of the furnace and the smoke stack by openings 14 of approved construction in the wall 6.

The furnace is provided in the front portion thereof with a flue 15 communicating with the uptake and with the boiler tubes. The front wall 16 is formed with an opening 17 in alinement with the fire-box 3, and the space between the front wall 16 and the firebox 3 is bridged by a hood 18 provided with a flared or inclined upper wall 19. The air regulating and directing means is carried upon the front wall 16 and is disposed so as to have alined communication with the opening 17 and comprises a raised base 20 formed with a central opening 21.

The base 20 carries an outstanding hollow thimble 22 of greater diameter than the open- Fig. 4 is ing 21, but concentrically alined therewith. A rotatable sleeve 23 surrounds the thimble 22 and is provided with a closed end 24 carrying a handle or lever 25 by which the sleeve 23 may be rotated. The rotatory movement of the sleeve 23 in either direction is limited by a pin 26 carried upon the thimble 22 and projecting through a transverse slot 27 in said sleeve as indicated in dotted lines in Fig. 4. The thimble 22 is provided with a plurality of elongated openings 28 and the sleeve 23 is provided with openings 29 having the same arrangement as and co-extensive with the openings 28, so as to be brought severally into registry with the respective openings 28. Owing'to the arrangement and construction of the thimble 22 and sleeve 23, the supply of air admitted into the fire-box 3 is reduced to a minimum degree I in the performance of its function as a smoke consuming agent. This is due to the fact that the air admitted through the openings 28 and 29 in their registering relation travels in a vortex jet, and in its rapid movement collects all the flying carbon particles and projects them through the openings 10 against the battle 9 which is heated to incandescence. Ordinarily the air flowing in undulating waves over the flames, in order to collect the unconsumed products of combustion is of such volume as to chill the flames. It is readily apparent that the amount of air admitted to the fire-box 3 above the grate L is controlled by the degree of registry between the openings 28 and 29.

The air passing into the fire-box 3 is heated to incandescence and consumes or burns the greater part of the particles of carbon in its 'vortex travel. Any particles still unconsumed, are projected against the baffle 9 which is heated to incandescence and said particles forcibly impinging against the same are broken up into minute or at least smaller particles and are completely consumed.

While the elements herein shown and described are well adapted to serve the purpose for which they are intended, it is to be under stood that changes in the size, proportion and minor details of the construction may be made without departing from the spirit and scope of the invention as defined in the ap pended claims.

Having described my invention, 1 claim:

1. A smoke consuming furnace compris ing a primary combustion chamber, a sec ondary combustion chamber, means for admitting and directing air in a vortex current through the primary combustion chamber and a bafiie located in the second combustion chamber in the path of said current.

2. A smoke consuming furnace comprising a primary combustion chamber or fire box, a secondary combustion or smoke consuming chamber, means for admitting air in a spirally moving current through the primary combustion chamber or fire box and a bafiie located in the secondary combustion or smoke consuming chamber in the path of said current for intercepting and dissipating the carbon particles carried thereby, said baffle being adapted to be heated to incandescence.

3. A smoke consuming furnace comprising a primary combustion chamber, a secondary combustion chamber, a bridge wall separating said chambers, means adapted to give an incoming current of air a spiral movement in the primary combustion chamber and a bafile rearward of said bridge wall for intercepting and dissipating carbon particles carried by said current.

4. A smoke consuming furnace, comprising the combination with a horizontal boiler and an inclosing housing, of a bridge wall beneath said housing dividing the space within the same into a primary combustion chamber and a secondary combustion chamber having communication through said bridge wall, means for admitting and directing air in a vortex current through said primary combustion chamber and means in said secondary combustion chamber for intercepting said current and dissipating the carbon particles carried thereby.

5. A smoke consuming furnace, comprising the combination with a horizontal boiler and an inclosing housing, of a bridge wall beneath said housing dividing the space within the same into a communicating primary combustion chamber and a secondary combustion chamber, means for admitting and directing air in a vortex current through said primary combustion chamber, means in said bridge wall for dividing said current into a plurality of smaller currents and a bafiie in said secondary combustion chamber for intercepting said smaller currents and dissipating'the carbon particles carried thereby.

In testimony whereof I afiix my signature in presence of two witnesses.

FRANK E. STINOHFIELD.

W'itnesses:

JOHN S. POWERS, C. P. SMITH. 

